[Merge] lp:~jani/goget-ubuntu-touch/parsefail into lp:goget-ubuntu-touch

[Jani Monoses]

Jani Monoses has proposed merging lp:~jani/goget-ubuntu-touch/parsefail into lp:goget-ubuntu-touch.

Commit message:
ubuntu-device-flash: Print error when parsing of cmdline args fails.

Requested reviews:
  Sergio Schvezov (sergiusens)

For more details, see:
https://code.launchpad.net/~jani/goget-ubuntu-touch/parsefail/+merge/221519

Print error to avoid headscratching when an option description is mistyped (for example has an extra space) and the program quits silently.
-- 
https://code.launchpad.net/~jani/goget-ubuntu-touch/parsefail/+merge/221519
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